Why are underground stems not considered as roots?

What are underground stems ? Describe various forms of underground stem. Draw diagram and give one example of each form.

What are underground stems? Give Examples.

The underground stem of ginger is called

Which underground stems are used as food?

Why underground stem is different from roots.

Underground stem that has contractile roots

Underground stem that has contractile roots

Underground stem that has contractile roots is

Underground stem that has contractile roots